Hair Samples Trace Decades-Long Decline in U.S. Lead Exposure After EPA Rules
TL;DR Summary
University of Utah researchers analyzed decades of hair samples from Utah families to track lead exposure; hair lead levels rose before 1970 but fell after EPA regulations, declining from about 50 ppm to under 1 ppm after 2020, demonstrating the public health benefits of eliminating lead from gasoline and other products.
- Mormon Hair Clippings Preserve Legacy of US Ban on Leaded Gas ScienceAlert
- Banning lead in gas worked. The proof is in our hair U. of Utah
- A century of hair clippings show lead exposure rates have plummeted Scientific American
- Old Hair Reveals How Toxic America Once Was SciTechDaily
- A century of hair samples proves leaded gas ban worked Ars Technica
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